CN101567483B - A Multi-Frequency Folded Loop Antenna - Google Patents
A Multi-Frequency Folded Loop Antenna Download PDFInfo
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- CN101567483B CN101567483B CN200810091263.2A CN200810091263A CN101567483B CN 101567483 B CN101567483 B CN 101567483B CN 200810091263 A CN200810091263 A CN 200810091263A CN 101567483 B CN101567483 B CN 101567483B
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- 239000002184 metal Substances 0.000 claims abstract description 65
- 229910052751 metal Inorganic materials 0.000 claims abstract description 65
- 230000005855 radiation Effects 0.000 claims abstract description 43
- 239000000758 substrate Substances 0.000 claims abstract description 34
- 238000010295 mobile communication Methods 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000005530 etching Methods 0.000 claims description 5
- 238000007639 printing Methods 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 4
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 238000013461 design Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The invention relates to a multi-frequency folding loop antenna, comprising: dielectric substrate, ground plane, radiating part and matching circuit. The ground plane is provided with a grounding point and is positioned on the dielectric substrate. The radiation section includes: the length of the annular metal wire of the radiation part is approximately half wavelength of the lowest resonance frequency of the antenna, and the annular metal wire is provided with a feed end and a grounding end, wherein the grounding end is electrically connected to the grounding point of the grounding surface, the annular metal wire is folded into a three-dimensional structure and is supported by the support medium, and the adjustment metal sheet of the radiation part is electrically connected to the annular metal wire. The matching circuit is located on the medium substrate, one end of the matching circuit is electrically connected to the feed-in end of the annular metal wire of the radiation part, and the other end of the matching circuit is connected to a signal source.
Description
Technical field
The present invention relates to a kind of loop aerial, relate in particular to a kind of multi-frequency folded coil antenna that is applicable to being built in mobile phone.
Background technology
Along with the fast development of radio communication, in wireless communications products, antenna role is more important, especially under light, thin, short, little trend trend, and the size of antenna, particularly its height will affect the value of a product.Yet take built-in antenna of cell phone as example, with regard to industry actual demand, it is more and more limited that interior of mobile phone can be placed the space of antenna, but can support that the antenna of Multiband-operation is again necessary trend.We find, loop aerial is compared and is more suitable for being used as built-in antenna of cell phone with traditional one pole or plate aerial, this is because loop aerial can use thin metal wire curved around forming, and its frequency range performance can obviously not reduce because live width is tiny again, this need to lean on the characteristic of roomy sheet metal increase frequency range different from traditional one pole or plate aerial, therefore loop aerial can use less size to realize the multi-band operation identical with conventional mobile phone antenna.Yet when loop aerial size is significantly dwindled, though low-frequency band can be contained the operation of GSM850 or GSM900, the more difficult GSM850/900 dual frequency operation of simultaneously containing but, therefore need seek to increase the technology of frequency range, correlation technique is as U.S. Patent Bulletin number US 7, 242, 364 No. B2 " double resonance antenna (Dual-Resonant Antenna) ", it discloses a kind of technology that match circuit is used in to the built-in antenna of cell phone of mobile communication system operation, can make single resonance mode there is double resonance characteristic, to reach the effect that increases frequency range, but this technology only discloses the application mode of the built-in antenna of cell phone of single frequency operation, cannot directly apply to double frequency (as 900MHz and 1800MHz) antenna for mobile phone.Meanwhile, applicable antenna for mobile phone is the antenna that length is approximately quarter-wave resonance.For addressing the above problem, we propose a kind of multi-frequency folded coil antenna design of innovation, by a curved annular that is coiled into of metal wire, then are folded to form the stereochemical structure of a small size; In operating technology, the low-frequency band of this antenna is used 1/2nd wavelength resonances mode of annular metal cord, high frequency band is operated by the synthetic wideband of high-order resonance mode of annular metal cord, be used in conjunction with again match circuit and realize the double resonance characteristic of low-frequency band, to increase frequency range, and use at least one to adjust the coupling that sheet metal improves high frequency band.Above-mentioned overall antenna structure can provide GSM850/900/1800/1900/UMTS five operation frequently, the application demand of realistic cell phone system.
Summary of the invention
In order to solve above problem, the object of the present invention is to provide a kind of multi-frequency folded coil antenna, it not only goes for the antenna for mobile phone design of GSM850 (824-894)/900 (890-960MHz)/1800 (1710-1880MHz)/1900 (1850-1990MHz)/UMTS (1920-2170MHz) frequency band, antenna size of the present invention is less in the antenna for mobile phone of same frequency band than general operation simultaneously, and it is simple in structure, operation mechanism is clear and definite, making is easy, and there is the interior of mobile phone space of saving.
To achieve these goals, multi-frequency folded coil antenna of the present invention comprises: medium substrate, ground plane, Department of Radiation and match circuit.Described ground plane is provided with earth point, and is positioned on described medium substrate, and described Department of Radiation comprises: Supporting Media, annular metal cord and an adjustment sheet metal.The length of the described annular metal cord of described Department of Radiation is roughly 1/2nd wavelength of antenna lowest resonance frequency, and be provided with feed side and earth terminal, wherein said earth terminal is connected electrically to the earth point of described ground plane, and described annular metal cord is folded into stereochemical structure, and supported by described Supporting Media, and the described adjustment sheet metal of described Department of Radiation is connected electrically to described annular metal cord.This match circuit is positioned on this medium substrate, and its one end is connected electrically to the feed side of the described annular metal cord of described Department of Radiation, and the other end is connected to signal source.Above-mentioned medium substrate is the system circuit board of mobile communications device, and the system ground that described ground plane is mobile communications device, and described ground plane is formed on described medium substrate by printing or etching technique, and the material of described Supporting Media is air or glass substrate or plastic material or ceramic material, and described match circuit has at least one capacitor and at least one inductor.
In this design, use the low-frequency band of 1/2nd wavelength resonances mode formation antennas of annular metal cord, and the high-order resonance mode of annular metal cord forms the high frequency band of antenna, be used in conjunction with again match circuit and realize the double resonance characteristic of low-frequency band, to increase frequency range, and use at least one to adjust the coupling that sheet metal improves high frequency band.Low-frequency band can provide the operation frequency range of about 200MHz (810-1010MHz), can contain GSM850/900 frequency band (824-960MHZ) operational requirements, and the return loss of this antenna in this frequency band has the performance higher than 6dB.High frequency band can provide the operation frequency range of about 615MHz (1635-2250MHz), the operational requirements that can contain GSM1800/1900/UMTS frequency band (1710-2170MHz), and the return loss value in this frequency band also has the performance higher than 6dB, meets application demand.This antenna designs is simple simultaneously, operation mechanism is clear and definite, and its size is less than the antenna for mobile phone of general same operation frequency band, saves the space that interior of mobile phone is placed antenna, but still can maintain the multi-frequency Characteristic of antenna, therefore have industry using value.
By part in ensuing description set forth the present invention other aspect and/or advantage, some will be clearly by descriptions, or can pass through enforcement of the present invention and learn.
Accompanying drawing explanation
Fig. 1 (a) is according to the antenna assumption diagram of the first embodiment of multi-frequency folded coil antenna of the present invention;
Fig. 1 (b) is according to the external match circuit of the first embodiment of multi-frequency folded coil antenna of the present invention;
Fig. 2 is according to multi-frequency folded coil antenna the second example structure figure of the present invention;
Fig. 3 means according to the measurement result chart of the return loss of the first embodiment of multi-frequency folded coil antenna of the present invention;
Fig. 4 (a) is the radiation pattern figure under the 859MHz of GSM850/900 frequency band according to the first embodiment of multi-frequency folded coil antenna of the present invention;
Fig. 4 (b) is the radiation pattern figure under the 925MHz of GSM850/900 frequency band according to the first embodiment of multi-frequency folded coil antenna of the present invention;
Fig. 5 (a) is the radiation pattern figure under the 1795MHz of GSM1800/1900/UMTS frequency band according to the first embodiment of multi-frequency folded coil antenna of the present invention;
Fig. 5 (b) is the radiation pattern figure under the 1920MHz of GSM1800/1900/UMTS frequency band according to the first embodiment of multi-frequency folded coil antenna of the present invention;
Fig. 5 (c) is the radiation pattern figure under the 2045MHz of GSM1800/1900/UMTS frequency band according to the first embodiment of multi-frequency folded coil antenna of the present invention;
Fig. 6 (a) is that multi-frequency folded coil antenna the first embodiment according to the present invention is the antenna gain pattern of GSM850/900 frequency band in operational frequency bands;
Fig. 6 (b) is that multi-frequency folded coil antenna the first embodiment according to the present invention is the antenna gain pattern of GSM1800/1900/UMTS frequency band in operational frequency bands;
Fig. 7 is according to first of multi-frequency folded coil antenna of the present invention other example structure figure;
Fig. 8 is according to second of multi-frequency folded coil antenna of the present invention other example structure figure;
Fig. 9 is the 3rd other example structure figure according to multi-frequency folded coil antenna of the present invention;
Figure 10 is the 4th other example structure figure according to multi-frequency folded coil antenna of the present invention.
Embodiment
First the main symbol in accompanying drawing is described:
1 for the first main embodiment of antenna of the present invention;
2 for the second main embodiment of antenna of the present invention;
7 for first other embodiment of antenna of the present invention;
8 for second other embodiment of antenna of the present invention;
9 for the 3rd other embodiment of antenna of the present invention;
10 for the 4th other embodiment of antenna of the present invention;
11 is medium substrate;
12 is ground plane;
121 is earth point;
13 is Department of Radiation;
131 is Supporting Media;
132,732,832 is annular metal cord;
133 is the feed side of annular metal cord;
134 is the earth terminal of annular metal cord;
135 is sheet metal;
14 is match circuit;
141 is the end points of match circuit;
142 are connected to signal source for the end points of match circuit;
15 is signal source;
21 is low-frequency band (1/2nd wavelength resonances mode);
22 is high frequency band (high-order resonance mode);
L1, L2 are inductor;
C is capacitor.
Fig. 1 (a) is according to the antenna assumption diagram of the first embodiment of multi-frequency folded coil antenna of the present invention, and Fig. 1 (b) is according to the external match circuit of the first embodiment of multi-frequency folded coil antenna of the present invention.The first embodiment of multi-frequency folded coil antenna of the present invention comprises: medium substrate 11, ground plane 12, Department of Radiation 13 and match circuit 14.Described ground plane 12 is provided with earth point 121, and is positioned on described medium substrate 11.Described Department of Radiation 13 comprises: Supporting Media 131, annular metal cord 132 and an adjustment sheet metal 135.These annular metal cord 132 length of described Department of Radiation 13 are roughly 1/2nd wavelength of antenna lowest resonance frequency, and be provided with feed side 133 and earth terminal 134, wherein said earth terminal 134 is connected electrically to the earth point 121 of described ground plane 12, and described annular metal cord 132 is folded into stereochemical structure, and supported by described Supporting Media 131, and the described adjustment sheet metal 135 of Department of Radiation 13 is connected electrically to described annular metal cord 132; Described match circuit 14 is positioned on described medium substrate 11, and its one end 141 is connected electrically to the feed side 133 of the described annular metal cord 132 of described Department of Radiation 13, and the other end 142 is connected to signal source 15.Above-mentioned medium substrate 11 is system circuit boards of mobile communications device, and the system ground that described ground plane 12 is mobile communications devices, and described ground plane 12 is formed on described medium substrate 11 by printing or etching technique, and described match circuit 14 comprises at least one capacitor and at least one inductor, as shown in Fig. 1 (b), after one of them capacitor C connects with an inductor L2, more in parallel with another inductor L1 and form match circuit 14.And capacitor C can be comprised of two capacitor's seriess.
Fig. 2 is the structure chart of multi-frequency folded coil antenna the second embodiment of the present invention.The second embodiment of multi-frequency folded coil antenna of the present invention comprises: medium substrate 11, ground plane 12 and Department of Radiation 13.Described ground plane 12 is provided with earth point 121, and is positioned on described medium substrate 11, and described Department of Radiation 13 comprises: Supporting Media 131, annular metal cord 132 and an adjustment sheet metal 135.The length of the described annular metal cord 132 of described Department of Radiation 13 is roughly 1/2nd wavelength of antenna lowest resonance frequency, and be provided with feed side 133 and earth terminal 134, wherein said feed side 133 is connected electrically to signal source 15, described earth terminal 134 is connected electrically to the earth point 121 of described ground plane 12, and this annular metal cord 132 is folded into stereochemical structure, and supported by this Supporting Media 131, and the described adjustment sheet metal 135 of described Department of Radiation 13 is connected electrically to described annular metal cord 132.Above-mentioned medium substrate 11 is system circuit boards of mobile communications device, and the system ground that described ground plane 12 is mobile communications device, and described ground plane 12 is formed on described medium substrate 11 by printing or etching technique.
Fig. 3 means the curve chart of return loss experimental measurements of the first embodiment of Fig. 1.The following size of this experimental selection and components values are measured: medium substrate 11 is of a size of 40 * 100mm for the FR4 glass substrate of thickness 0.8mm, ground plane 12
2, and be etched in the surface of medium substrate 11.The Supporting Media 131 of Department of Radiation 13 is air, that is the Department of Radiation in the first embodiment 13 is hollow structure, and its volume is only 40 * 3 * 5mm
3or 0.6cm
3, 132 surfaces that surround the Supporting Media 131 of this hollow of annular metal cord.The total length of annular metal cord 132 is about 180mm, be roughly 1/2nd wavelength of antenna lowest resonance frequency, and be provided with feed side 133 and earth terminal 134, wherein said earth terminal 134 is connected electrically to the earth point 121 of described ground plane 12, and described annular metal cord 132 is folded into stereochemical structure as previously mentioned, surround Supporting Media 131 surfaces of hollow, and the described adjustment sheet metal 135 of described Department of Radiation 13 is of a size of 16 * 1.3mm
2, and be connected electrically to described annular metal cord 132.Described match circuit 14 is positioned on described medium substrate 11, and its one end 141 is connected electrically to the feed side 133 of the described annular metal cord 132 of described Department of Radiation 13, and the other end 142 is connected to signal source 15.The C value of described match circuit 14 selects 1pF, L2 value to select 9.1nH, L1 value to select 4.3nH.The length of the annular metal cord 132 of this design employing is about 180mm, / 2nd wavelength for 900MHz, therefore low-frequency band 21 represents 1/2nd wavelength resonances mode of antenna, high frequency band 22 is that the high-order resonance mode of antenna is synthetic, is mainly the long resonance mode of all-wave and 1/2nd wavelength resonances mode synthesizeds of annular metal cord 132.Technology emphasis has binomial herein, and the one, use match circuit 14 to make low-frequency band 21 increase imaginary impedance zero point, make this resonance mode there is double resonance characteristic and increase frequency range, another is to use to adjust the impedance matching that sheet metal 135 improves high frequency band 22.Not yet using under the situation of match circuit 14, the frequency range of 1/2nd wavelength resonances mode of annular metal cord 132 cannot be contained GSM850/900 operation frequency range simultaneously, high frequency band, because having used adjustment sheet metal 135 to adjust its impedance matching, can be contained GSM1800/1900/UMTS operation frequency range.Match circuit 14 can not affect under the prerequisite of high frequency band 22 simultaneously, increases the frequency range of low-frequency band.Match circuit 14 as used herein is that 3dB frequency range is only the band resistance circuit of 170MHz, the about 1100MHz of its resonance centre frequency, this match circuit 14 has real impedance and the imaginary impedance of acute variation at its resonance centre frequency place, wherein the variation of imaginary impedance contributes to 1/2nd wavelength resonances mode increase imaginary parts of annular metal cord 132 to resonate zero point, make this low-frequency band 21 there is double resonance phenomenon, and realize broadband operation and contain GSM850/900 operation frequency range.Described match circuit 14 is designed to about 1100MHz because band hinders centre frequency simultaneously, so very little for high frequency band 22 impacts.In the measurement result of return loss, low-frequency band 21 is for having 1/2nd wavelength resonances mode of double resonance characteristic, the operation frequency range of about 200MHz (810-1010MHz) is provided, the operational requirements that can contain GSM 850/900 frequency band, and the return loss of this antenna in this frequency band has the performance higher than 6dB.22 of high frequency bands can provide the operation frequency range of about 615MHz (1635-2250MHz), can contain the operational requirements of GSM1800/1900/UMTS frequency band, and the return loss value in this frequency band also has the performance higher than 6dB, meet application demand.
Moreover the difference of the second embodiment of Fig. 2 and the first embodiment of Fig. 1 is, the Department of Radiation 13 of the second embodiment is of a size of 40 * 5 * 6mm
3or 1.2cm
3, making antenna that this size is greater than the first embodiment only needs to change and adjusts the position that sheet metal 135 is connected electrically to annular metal cord 132, also can realize and contain GSM850/900/18001900/UMTS five design of operation frequently.This means, whether adopt the technology of match circuit 14, depend on the dimensional space that antenna takies, when antenna volume is dwindled and is made low-frequency band to contain GSM850/900 frequency band simultaneously, use the design's match circuit 14, can make low-frequency band there is double resonance phenomenon, and then increase frequency range to contain operational requirements.
Fig. 4 (a) is the radiation pattern figure under the 859MHz of GSM850/900 frequency band according to the first embodiment of multi-frequency folded coil antenna of the present invention, and Fig. 4 (b) is the radiation pattern figure under the 925MHz of GSM850/900 frequency band according to the first embodiment of multi-frequency folded coil antenna of the present invention.The low-frequency band 21 of containing this operational frequency bands is 1/2nd wavelength resonances mode of antenna.Draw thus following result, the resonate radiation pattern of 1/2nd wavelength resonances mode that draw of annular metal cord, the radiation pattern still resonating when the same frequency to traditional unipole antenna or plate aerial is similar.
Fig. 5 (a) is the radiation pattern figure under the 1795MHz of GSM1800/1900/UMTS frequency band according to the first embodiment of multi-frequency folded coil antenna of the present invention, Fig. 5 (b) is the radiation pattern figure under the 1920MHz of GSM1800/1900/UMTS frequency band according to the first embodiment of multi-frequency folded coil antenna of the present invention, and Fig. 5 (c) is the radiation pattern figure under the 2045MHz of GSM1800/1900/UMTS frequency band according to the first embodiment of multi-frequency folded coil antenna of the present invention.The high frequency band 22 of containing this operational frequency bands is mainly synthetic by all-wave length and 1/2nd wavelength resonances mode of antenna.Draw thus following result, the radiation pattern in high frequency band 22 is subject to the impact of current zero on ground plane, and the depression points of its x-z and y-z plane field pattern is more than the radiation pattern of low-frequency band 21, but still does not affect the demand in practical application.
Fig. 6 (a) is that multi-frequency folded coil antenna the first embodiment according to the present invention is the antenna gain pattern of GSM850/900 frequency band in operational frequency bands, and Fig. 6 (b) is that multi-frequency folded coil antenna the first embodiment according to the present invention is the antenna gain pattern of GSM1800/1900/UMTS frequency band in operational frequency bands.In figure, measurement data is known, be about-1.0--0.1dBi of the yield value of the design in GSM850/900 operational frequency bands, and yield value in GSM1800/1900/UMTS operational frequency bands is about 1.7-2.6dBi, all demand in realistic application.
Fig. 7, Fig. 8, Fig. 9 and Figure 10 represent respectively the structure chart of first, second, third and the 4th other embodiment of multi-frequency folded coil antenna of the present invention.First other embodiment and second other embodiment of antenna of the present invention are identical with the overall structure of the first embodiment, the 3rd other embodiment and the 4th other embodiment are identical with the overall structure of the second embodiment, wherein only have the folding mode of annular metal cord different, first other embodiment and the 3rd other embodiment have respectively two adjustment sheet metals simultaneously.Above embodiment can realize the effect identical with the first embodiment or the second embodiment.
Experimental result demonstration of the present invention, the embodiment of multi-frequency folded coil antenna of the present invention can realize the antenna for mobile phone design that is applicable to GSM850/900/1800/1900/UMTS frequency band.Wherein low-frequency band 21 (containing GSM850/900 frequency band) frequency range is about 200MHz (810-1010MHz), and the frequency range of high frequency band 22 (containing GSM1800/1900/UMTS frequency band) is about 615MHz (1635-2250MHz), application demand that all can realistic cell phone system.
Comprehensive above-mentioned explanation, antenna of the present invention simple in structure, operation mechanism is clear and definite, cost of manufacture is low, in reduction antenna for mobile phone size, still can maintain the multi-frequency Characteristic of antenna, therefore antenna of the present invention has high industrial using value, is enough to meet the category of invention.
In above explanation, with embodiments of the invention, content of the present invention has been described, but scope of the present invention is not limited to the content of embodiment.Under those of skill in the art take embodiments of the invention and can change and revise as basis, but within any modifications and changes all belong to the scope that the present invention protects.
Claims (11)
1. a multi-frequency folded coil antenna, comprises:
Medium substrate;
Ground plane, has earth point, and is positioned on this medium substrate;
Department of Radiation, this Department of Radiation comprises:
Supporting Media;
Annular metal cord, length is roughly 1/2nd wavelength of antenna lowest resonance frequency, and is provided with feed side and earth terminal, and wherein said earth terminal is connected electrically to the described earth point of described ground plane, and described annular metal cord is folded into stereochemical structure, and supported by this Supporting Media;
At least one adjusts sheet metal, be connected electrically to this annular metal cord and
In addition, multi-frequency folded coil antenna also comprises match circuit, is positioned on this medium substrate, and its one end is connected electrically to the described feed side of the described annular metal cord of described Department of Radiation, and the other end is connected to signal source.
2. multi-frequency folded coil antenna according to claim 1, is characterized in that described medium substrate is the system circuit board of mobile communications device.
3. multi-frequency folded coil antenna according to claim 1, is characterized in that described ground plane is the system ground of mobile communications device.
4. multi-frequency folded coil antenna according to claim 1, is characterized in that described ground plane is formed on described medium substrate by printing or etching technique.
5. multi-frequency folded coil antenna according to claim 1, the material that it is characterized in that described Supporting Media is air, glass substrate, plastic material or ceramic material.
6. multi-frequency folded coil antenna according to claim 1, is characterized in that described match circuit comprises at least one capacitor and at least one inductor.
7. a multi-frequency folded coil antenna, comprises:
Medium substrate;
Ground plane, has earth point, and is positioned on this medium substrate;
Department of Radiation, this Department of Radiation comprises:
Supporting Media;
Annular metal cord, length is roughly 1/2nd wavelength of antenna lowest resonance frequency, and is provided with feed side and earth terminal, and wherein said earth terminal is connected electrically to the described earth point of described ground plane, and described annular metal cord is folded into stereochemical structure, and supported by this Supporting Media;
At least one adjusts sheet metal, is connected electrically to this annular metal cord.
8. multi-frequency folded coil antenna according to claim 7, is characterized in that described medium substrate is the system circuit board of mobile communications device.
9. multi-frequency folded coil antenna according to claim 7, is characterized in that described ground plane is the system ground of mobile communications device.
10. multi-frequency folded coil antenna according to claim 7, is characterized in that described ground plane is formed on described medium substrate by printing or etching technique.
11. multi-frequency folded coil antennas according to claim 7, the material that it is characterized in that described Supporting Media is air, glass substrate, plastic material or ceramic material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810091263.2A CN101567483B (en) | 2008-04-23 | 2008-04-23 | A Multi-Frequency Folded Loop Antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810091263.2A CN101567483B (en) | 2008-04-23 | 2008-04-23 | A Multi-Frequency Folded Loop Antenna |
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| CN101567483A CN101567483A (en) | 2009-10-28 |
| CN101567483B true CN101567483B (en) | 2014-03-19 |
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| CN200810091263.2A Expired - Fee Related CN101567483B (en) | 2008-04-23 | 2008-04-23 | A Multi-Frequency Folded Loop Antenna |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101997166B (en) * | 2010-10-27 | 2013-12-11 | 惠州Tcl移动通信有限公司 | Annular multiband antenna and wireless communication device thereof |
| CN103794886B (en) * | 2012-02-23 | 2016-02-24 | 上海安费诺永亿通讯电子有限公司 | A kind of Multimode resonant antenna system |
| GB2509302B (en) * | 2012-11-08 | 2016-09-14 | Microsoft Technology Licensing Llc | Space saving multiband antenna |
| TWI511375B (en) | 2013-05-02 | 2015-12-01 | Acer Inc | Communication device with ground plane antenna |
| CN104157955B (en) * | 2013-05-13 | 2017-08-04 | 宏碁股份有限公司 | Communication device with ground plane antenna |
| CN104466394A (en) * | 2013-09-12 | 2015-03-25 | 启碁科技股份有限公司 | Broadband antenna |
| CN104701609B (en) * | 2013-12-05 | 2018-01-05 | 宏碁股份有限公司 | Communication device with coupled feed multi-frequency antenna element |
| WO2015100654A1 (en) * | 2013-12-31 | 2015-07-09 | 华为终端有限公司 | Loop antenna and mobile terminal |
| CN106505314B (en) * | 2016-12-21 | 2023-06-13 | 广西科技大学鹿山学院 | Multifrequency 4G cell-phone antenna of bending |
| CN107039754A (en) * | 2017-04-20 | 2017-08-11 | 深圳市拓频通讯设备有限公司 | A kind of mobile phone loss prevention external antenna |
| CN114824768B (en) * | 2022-03-31 | 2024-07-02 | 上海创功通讯技术有限公司 | Loop antenna and TWS earphone |
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Granted publication date: 20140319 |